Move CFX_UnownedPtr to UnownedPtr

This CL moves CFX_UnownedPtr to UnownedPtr and places in the fxcrt
namespace.

Bug: pdfium:898
Change-Id: I6d1fa463f365e5cb3aafa8c8a7a5f7eff62ed8e0
Reviewed-on: https://pdfium-review.googlesource.com/14620
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
diff --git a/fxjs/cfxjse_context.cpp b/fxjs/cfxjse_context.cpp
index bef7597..ad6dbac 100644
--- a/fxjs/cfxjse_context.cpp
+++ b/fxjs/cfxjse_context.cpp
@@ -68,7 +68,7 @@
   void* operator new(size_t size) = delete;
   void operator delete(void*, size_t) = delete;
 
-  CFX_UnownedPtr<CFXJSE_Context> m_context;
+  UnownedPtr<CFXJSE_Context> m_context;
   CFXJSE_ScopeUtil_IsolateHandle m_parent;
   v8::Context::Scope m_cscope;
 };